Relax. There is no way you could have acquired HIV from the exposure you describe. No chance, none, impossible, no way. The medical events since then (colds, otitis media, etc) are not signs of immune deficiency or HIV.
Having said that, if you are anxious or concerned enough to go online to for assurance of what you know to be true anyway, it is likely that my reassurance won't be enough. If it will, fine. But if you will sleep better with a negative test result to confirm it, get tested. You can do it completely confidentially at your local health department STD clinic.
Good luck-- HHH, MD
thanks. i have no other risk factors other than that single event, so your reassurance is good enough for me. i think having a small child makes one question their own mortality more often.